Odpowiedź:
a) -12 + 14 = 7x + 5x
2 = 12x
x = 1/6
b) 7x - 4 = -7 × 6
7x - 4 = -42
7x = -38
x = -38/7
x = -5 3/7
c) 4x - 18 + 12x = 5x - 18
16x = 5x
11x = 0
x = 0
d) 15 - 8x = - 27
8x = 42
x = 5 1/4
e) (3x-8)/3 - (7-5x)/2 = 11 |×6
2(3x-8) - 3(7-5x) = 66
6x - 16 - 21 + 15x = 66
21x = 66 + 37
21x = 103
x = 4 19/21
